Controllable red, green, blue (RGB) and bright white upconversion luminescence of Lu2O3:Yb3+/Er3+/Tm3+ nanocrystals through single laser excitation at 980 nm.
Controllable red, green, blue (RGB) and bright white upconversion luminescence of Lu2O3:Yb3+/Er3+/Tm3+ nanocrystals through single laser excitation at 980 nm.
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DOI：
10.1002/chem.200802106
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
Jun Yang;Cuimiao Zhang;Chong Peng;Chunxia Li;Lili Wang;Ruitao Chai;Jun Lin
中科院分区：
文献类型：
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作者：
Jun Yang;Cuimiao Zhang;Chong Peng;Chunxia Li;Lili Wang;Ruitao Chai;Jun Lin
光棒极了!在980 nm单激光激发下成功合成了具有可控红、绿、蓝（RGB）和亮白色上转换发光的Lu(2)O(3):Yb(3+)/Er(3+)/Tm（3+）纳米晶体（见图）。由于丰富的UC PL颜色，它可以作为荧光团在彩色显示，背光，UC激光器，光子学和生物医学领域的潜在应用。采用溶剂热法合成了Lu(2)O(3):Yb(3+)/Er(3+)/Tm（3+）纳米晶体，并在800℃下进行热处理。采用粉末x射线衍射、透射电子显微镜、上转换光致发光光谱和动力学衰变对样品进行表征。在980 nm的单波长二极管激光激发下，由于Tm（3+）的(1)G(4)—>(3)H(6)跃迁，在477 nm和490 nm附近观测到Lu(2)O(3):Yb（3+）、Tm（3+）纳米晶体的亮蓝色发光。观察到Lu(2)O(3):Er（3+）纳米晶体在540 nm和565 nm附近的亮绿色UC发射，分别属于Er（3+）的(2)H（11/2）—>(4)I（15/2）和(4)S（3/2）—>(4)I（15/2）跃迁。随着Yb（3+）在Lu(2)O(3):Er（3+）纳米晶体中浓度的增加，绿色发光强度与红色发光强度之比减小。在足够数量的Yb（3+）相对于Er（3+）时，由于Er（3+）的(4)F（9/2）—>(4)I（15/2）跃迁，Lu(2)O(3):Yb(3+)/Er（3+）中心在662 nm处的亮红色UC发光占主导地位。根据不同掺杂的Lu(2)O(3):RE（3+）纳米晶体产生的红、绿、蓝发射，通过在Lu(2)O（3 +）纳米晶体中适当掺杂Yb（3+）、Tm（3+）和Er(3+)，可以产生包括白色在内的多种颜色的发光。即，Lu(2)O(3): 3% Yb(3+)/ 0.2% Tm(3+)/ 0.4% Er（3+）纳米晶体表现出合适的蓝、绿、红（RGB）发射强度，产生完美明亮的白光，CIE-x=0.3456, CIE-y=0.3179，非常接近标准等能白光照明（x=0.33, y=0.33）。由于Lu(2)O(3):Yb(3+)/Er(3+)/Tm（3+）纳米晶体在980 nm激光二极管（LD）激发下具有丰富的从RGB到白色的发光颜色，它们在彩色显示、背光、UC激光器、光子学和生物医学等领域具有潜在的荧光团应用前景。
Light fantastic! Lu(2)O(3):Yb(3+)/Er(3+)/Tm(3+) nanocrystals with controllable red, green, blue (RGB) and bright white upconversion luminescence by a single laser excitation of 980 nm have been successfully synthesized (see picture). Due to abundant UC PL colors, it can potentially be used as fluorophores in the field of color displays, back light, UC lasers, photonics, and biomedicine.Lu(2)O(3):Yb(3+)/Er(3+)/Tm(3+) nanocrystals have been successfully synthesized by a solvothermal process followed by a subsequent heat treatment at 800 degrees C. Powder X-ray diffraction, transmission electron microscopy, upconversion photoluminescence spectra, and kinetic decay were used to characterize the samples. Under single-wavelength diode laser excitation of 980 nm, the bright blue emissions of Lu(2)O(3):Yb(3+), Tm(3+) nanocrystals near 477 and 490 nm were observed due to the (1)G(4)-->(3)H(6) transition of Tm(3+). The bright green UC emissions of Lu(2)O(3):Er(3+) nanocrystals appeared near 540 and 565 nm were observed and assigned to the (2)H(11/2)-->(4)I(15/2) and (4)S(3/2)-->(4)I(15/2) transitions, respectively, of Er(3+). The ratio of the intensity of green luminescence to that of red luminescence decreases with an increase of concentration of Yb(3+) in Lu(2)O(3):Er(3+) nanocrystals. In sufficient quantities of Yb(3+) with resprct to Er(3+), the bright red UC emission of Lu(2)O(3):Yb(3+)/Er(3+) centered at 662 nm was predominant, due to the (4)F(9/2)-->(4)I(15/2) transition of Er(3+). Based on the generation of red, green, and blue emissions in the different doped Lu(2)O(3):RE(3+) nanocrystals, it is possible to produce the luminescence with a wide spectrum of colors, including white, by the appropriate doping of Yb(3+), Tm(3+), and Er(3+) in the present Lu(2)O(3) nanocrystals. Namely, Lu(2)O(3):3 %Yb(3+)/0.2 %Tm(3+)/0.4 %Er(3+) nanocrystals show suitable intensities of blue, green, and red (RGB) emission, resulting in the production of perfect and bright white light with CIE-x=0.3456 and CIE-y=0.3179, which is very close to the standard equal energy white light illuminate (x=0.33, y=0.33). Because of abundant luminescent colors from RGB to white in Lu(2)O(3):Yb(3+)/Er(3+)/Tm(3+) nanocrystals under 980 nm laser diode (LD) excitation, they can potentially be used as fluorophores in the field of color displays, back light, UC lasers, photonics, and biomedicine.